
1, 7, 9, 13, 21, 67, 77, 81, 89, 101, 117, 131, 161, 181, 229, 641, 753, 789, 911, 1351, 1461, 1819, 2391, 2951, 4381, 4531, 5633, 6577, 6671, 8521, 10059, 10453, 13571, 15427, 15541, 15969, 16601, 49013, 69831, 118213, 134709, 135281, 180973, 271961, 324567
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


LINKS



MATHEMATICA

Select[Range[1000], PrimeQ[221*2^# + 1] & ] (* Robert Price, Dec 19 2018 *)


PROG



CROSSREFS



KEYWORD

nonn,hard


AUTHOR



EXTENSIONS

a(41)a(51) from the Ray Ballinger and Wilfrid Keller link by Robert Price, Dec 19 2018
Terms moved from Data section to bfile, and new term added to bfile, by Jeppe Stig Nielsen, Apr 19 2020


STATUS

approved

